single dentures

Question 1

What is the definition of a single complete denture? ==

Answer 1

A denture constructed for either the maxillary or mandibular ridge to oppose a dentulous or partially edentulous arch.

Question 2

What are the challenges of mandibular single dentures? ==

Answer 2

Smaller denture-bearing area, porous cancellous ridge, faster resorption, and reduced tolerance to occlusal stresses.

Question 3

How are remaining teeth used as overdenture abutments and why?==

Answer 3

To retain and reduce them in contour and height for overdenture support instead of extraction.

Question 4

What are the benefits of implant-supported overdentures? ==

Answer 4

They provide better support and stability for lower single dentures.

Question 5

Why is lining lower single dentures with a resilient permanent soft liner recommended? ==

Answer 5

To provide cushioning and adapt better to the tissues, reducing stress.

Question 6

When might extraction of maxillary teeth be considered in mandibular single denture cases? ==

Answer 6

When opposing natural teeth or partial dentures cause excessive occlusal stress.

Question 7

Why are maxillary single dentures preferred over mandibular ones? ==

Answer 7

Due to the larger denture-bearing area and better tissue support.

Question 8

What problem arises from the excessive forces of opposing natural teeth in maxillary single dentures? ==

Answer 8

Rapid resorption of the residual ridge and the formation of flabby tissues.

Question 9

How can you reduce the impact of excessive forces on maxillary single dentures? ==

Answer 9

By maximizing denture base extension to distribute forces over a larger area.

Question 10

What causes frequent fractures in maxillary single dentures? ==

Answer 10

Excessive pressure from opposing natural teeth.

Question 11

How can fractures in maxillary single dentures be prevented? ==

Answer 11

Using a strong metal base to withstand the applied forces.

Question 12

How do tilted or malposed teeth affect maxillary single dentures? ==

Answer 12

They create an irregular occlusal plane, causing horizontal forces that destabilize the denture.

Question 13

What treatment can address mildly tilted posterior teeth? ==

Answer 13

Selective grinding of the teeth to reshape them.

Question 14

What is the treatment for severely tilted teeth in maxillary single denture cases? ==

Answer 14

Extraction or orthodontic repositioning.

Question 15

How does deep bite from over-erupted lower anterior teeth affect upper dentures? ==

Answer 15

It can lead to improper occlusion and a steep incisal angle.

Question 16

What adjustment is necessary for the wax rim in cases of over-erupted lower anterior teeth? ==

Answer 16

Wax should be removed palatally to allow proper contact between the teeth and the wax rim.

Question 17

Why is occlusal adjustment necessary before single denture construction? ==

Answer 17

To control the horizontal forces that affect denture stability and occlusal plane.

Question 18

What is the first step in the first technique for occlusal adjustment? ==

Answer 18

Mounting upper and lower casts on the articulator using a centric relation record.

Question 19

What is the purpose of marking occlusal interferences in the first technique? ==

Answer 19

To guide the occlusal adjustment both on the cast and in the patient’s mouth.

Question 20

How is a U-shaped metal occlusal template used in the second technique? ==

Answer 20

It is placed on the lower cast to identify over-erupted cusps that require reduction.

Question 21

How does the second technique transfer changes to the patient’s mouth? ==

Answer 21

By reducing over-erupted cusps on the cast and then performing the same adjustments in the patient’s mouth.

Question 22

What is the clear acrylic resin template used for in the third technique? ==

Answer 22

To mark occlusal interferences on the natural teeth by coating it with pressure-indicating paste.

Question 23

How is the occlusal adjustment completed in the third technique? ==

Answer 23

By grinding the natural teeth based on the markings from the template until it seats properly

Question 24

How is the selection of posterior teeth determined for a single denture? ==

Answer 24

It is based on the occlusal form of the natural posterior teeth.

Question 25

When are non-anatomic teeth used in single dentures? ==

Answer 25

When natural cusps are worn or reduced during occlusal adjustment.

Question 26

What are the advantages of acrylic teeth in single dentures? ==

Answer 26

Acrylic teeth are easily adjusted during occlusal modifications and do not wear down opposing natural teeth.

Question 27

What is IPN resin and why is it used for single dentures? ==

Answer 27

IPN resin is a highly cross-linked polymer with greater wear resistance than conventional acrylic resin.

Question 28

Why are porcelain teeth not recommended for single dentures? ==

Answer 28

Porcelain teeth are prone to fracture during occlusal adjustment and do not mark well with articulating paper.

Question 29

What are acrylic resin teeth with gold occlusal surfaces used for? ==

Answer 29

They provide the best material for artificial occlusion that opposes natural teeth, as gold is durable and maintains occlusal stability.

Question 30

How are amalgam stops used in acrylic resin teeth? ==

Answer 30

Amalgam is inserted into the occlusal surfaces of acrylic teeth to reduce wear and simulate the patient’s jaw movements for balanced occlusion.

Question 31

What is combination syndrome (Kelly’s syndrome)? ==

Answer 31

It is an oral condition that occurs when an edentulous maxilla opposes natural mandibular anterior teeth, leading to bone loss and other complications.

Question 32

How can combination syndrome be prevented or treated? ==

Answer 32

It can be prevented with proper occlusal adjustments, balanced dentures, and sometimes by placing implants or using overdentures.

Question 33

What is the simplest method to adjust the occlusal plane of natural teeth before constructing a single denture? ==

Answer 33

Selective grinding of malposed teeth.

Question 34

What is the name of the syndrome caused by long-term use of a mandibular distal extension partial denture against a complete maxillary denture? ==

Answer 34

Kelly’s syndrome.

Question 35

What are alternative treatments for severely malposed teeth in single denture cases? ==

Answer 35

Crowning, extraction, or orthodontic treatment.